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Title: naturally aspirated ME7 engines Post by: lulu2003 on February 26, 2013, 06:06:27 AM did I miss a thread?
any experiences? I would consider touching any load maps won't help me improving WOT. It also seems that narrow band Lambda sensors were used deep in the latest decade. thx in advance Title: Re: naturally aspirated ME7 engines Post by: prj on February 26, 2013, 09:12:11 AM Fuel and spark.
Title: Re: naturally aspirated ME7 engines Post by: nyet on February 26, 2013, 12:52:28 PM meh. waste of time, imo
Title: Re: naturally aspirated ME7 engines Post by: k0mpresd on February 26, 2013, 01:40:52 PM meh. waste of time, imo it only takes 5 minutes to tune. not a complete waste of time. Title: Re: naturally aspirated ME7 engines Post by: nyet on February 26, 2013, 01:42:41 PM 5 minutes for 3hp
YAY! Title: Re: naturally aspirated ME7 engines Post by: userpike on February 26, 2013, 02:13:37 PM I read somewhere that Integrated Enginering made a custom set of cams to convert the 1.8t to NA. I cant find the link though..
Title: Re: naturally aspirated ME7 engines Post by: cerips on February 26, 2013, 02:40:16 PM Did you not get a naturally aspirated 1.8 20v in the US then?
In Europe we got the ADR 125 BHP (I think) 1.8 20v NA engine. Title: Re: naturally aspirated ME7 engines Post by: k0mpresd on February 26, 2013, 03:53:00 PM 5 minutes for 3hp YAY! if youre na, every little bit helps i guess. Did you not get a naturally aspirated 1.8 20v in the US then? In Europe we got the ADR 125 BHP (I think) 1.8 20v NA engine. nope. Title: Re: naturally aspirated ME7 engines Post by: userpike on February 26, 2013, 10:19:14 PM Title: Re: naturally aspirated ME7 engines Post by: ddillenger on February 26, 2013, 10:34:48 PM Volumetric efficiency. The limiting factor is the amount of air you can get into the cylinders. Without a way of increasing that, the best you can hope for is optimizing power output.
I suppose by altering the cam changeover and the hardware you can increase efficiency, but the results will pale in comparison to forced induction engines. In short, advance the timing to the limit (based on the available fuel) and give it some fuel. I'm sure changing the maps relating to pedal/throttle body could make it FEEL faster, but I doubt that would be worth while. This is all my take on it, YMMV. EDIT: I should note that this is all based on tuning an otherwise stock engine. Obviously optimizing the tune for hardware changes will be more beneficial. Title: Re: naturally aspirated ME7 engines Post by: nyet on February 26, 2013, 10:48:19 PM why only 3hp? Because the N/A tuner community thinks 3hp is amazing. Title: Re: naturally aspirated ME7 engines Post by: userpike on February 27, 2013, 12:01:13 AM Volumetric efficiency. The limiting factor is the amount of air you can get into the cylinders. Without a way of increasing that, the best you can hope for is optimizing power output. I suppose by altering the cam changeover and the hardware you can increase efficiency, but the results will pale in comparison to forced induction engines. In short, advance the timing to the limit (based on the available fuel) and give it some fuel. I'm sure changing the maps relating to pedal/throttle body could make it FEEL faster, but I doubt that would be worth while. This is all my take on it, YMMV. EDIT: I should note that this is all based on tuning an otherwise stock engine. Obviously optimizing the tune for hardware changes will be more beneficial. [/quote ]. Yes first thing would be a cam change because the 1.8t cams are for forced induction only. Inertia supercharging is a way to get more into the cylinders. You get that with cams that implement alot of valve overlap and high lift. Need high compression, 11 to 1 max on pump gas. I bet you could manip the maps for the vvt in your favor somwhat like the ricers do with their vtec. I think a N/A 1.8t with stock cams would make like 40 whole hp lol realisticly. Title: Re: naturally aspirated ME7 engines Post by: lulu2003 on February 27, 2013, 07:21:43 AM thanks for your opinions!
N/A engines seem to be a lot more aggressive in their OEM KFZW to gain some HP. It's obviously a matter of dyno effort to get some handful HP, may be together with a good exhaust and fuel. Title: Re: naturally aspirated ME7 engines Post by: userpike on February 27, 2013, 09:48:13 AM thanks for your opinions! N/A engines seem to be a lot more aggressive in their OEM KFZW to gain some HP. It's obviously a matter of dyno effort to get some handful HP, may be together with a good exhaust and fuel. please post a .bin if you can. i would like to see what the differences are in the maps. Title: Re: naturally aspirated ME7 engines Post by: robin on February 27, 2013, 10:06:47 AM Adding timing, reducing knock enrich, and giving the motor the fuel it wants rather than relying on an EGT model is good for 15-20BHP on the N/A 4.2 V8s that use ME7. There's definitely gains to be had.
Title: Re: naturally aspirated ME7 engines Post by: RaraK on March 01, 2013, 05:53:26 AM thanks for your opinions! N/A engines seem to be a lot more aggressive in their OEM KFZW to gain some HP. It's obviously a matter of dyno effort to get some handful HP, may be together with a good exhaust and fuel. a lot more aggressive or a lot more passive? lol. In the USA i have not seen what i would call even remotely aggressive KFZW. You can add a lot of timing on these US spec cars. N/A cars benefit from driveability and more response with tunes, i would say for performance, but rather a sportier refinement. Like said HP gains are minimal ~20hp give or take a little on 24v vr6 and 4.2 v8 Title: Re: naturally aspirated ME7 engines Post by: Chipwizard on March 12, 2013, 03:03:03 PM Does anyone know what I need to change to alter the rpms that the intake manifold changes over (on a ME7.2, in a Boxster-S)? It's had a pair of cams in it and the resonance flap needs opening about 500 rpm later.
I've been looking through the file till my eyes bled but the trouble is I don't actually know what I'm looking for. The valve closes around 3400 rpm and >13% load and then re-opens around 5400 rpm. I've been looking for tables and bytes with values around 85 and 135 (decimal) in them, assuming (perhaps wrongly) that there's a multiple of 40 involved, since most of the rpm based map headers use a 40 rpm multiple. It could of course be a map with rpm and load as axis, and simple on/off as the variable, I just don't know.... Also, the variocam switch points would be useful too, if anyone knows what that's called? Thanks in advance for any help guys. Title: Re: naturally aspirated ME7 engines Post by: ddillenger on March 12, 2013, 03:27:47 PM sumode
Title: Re: naturally aspirated ME7 engines Post by: Chipwizard on March 12, 2013, 04:03:32 PM Thanks for the quick reply.
I did read that in the translated fuction-book but the maps, SUMODE0 is set to 1, SUMODE1 is set to 1 .....SUMODE3 is set to 3, which doesn't seem to make much sense to me. There are maps with 'Sumode' in their description but they appear not to have the characteristics that the engine operates with. The cams switch fully on from very low rpm, once some load is applied and switch back around 5800 rpm, so basically what I am trying to say is that their operation is rather digital, and the maps with Sumode in their description have much variation in their output values, such as you might get with the later, 'variocam-plus' setup. Cheers :-) Title: Re: naturally aspirated ME7 engines Post by: ddillenger on March 12, 2013, 04:13:08 PM To be honest I looked into it, but in the end abandoned the project due to hardware differences. I wasn't being curt in my reply, that's about all I had to add.
Wish I could be more help. Title: Re: naturally aspirated ME7 engines Post by: Chipwizard on March 12, 2013, 04:24:31 PM No problem, any help at all is greatly appreciated.
Cheers :-) |